系出名门Android(7) - 控件(View)之ZoomControls, Include, VideoView, WebView, RatingBar, Tab, Spinner, Chronometer, ScrollView

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系出名门Android(7) - 控件(View)之ZoomControls, Include, VideoView, WebView, RatingBar, Tab, Spinner, Chronometer, ScrollView

作者：webabcd


介绍
在 Android 中使用各种控件(View)

• ZoomControls - 放大/缩小按钮控件
• Include - 整合控件
• VideoView - 视频播放控件
• WebView - 浏览器控件
• RatingBar - 评分控件
• Tab - 选项卡控件
• Spinner - 下拉框控件
• Chronometer - 计时器控件
• ScrollView - 滚动条控件

1、ZoomControls 的 Demo
zoomcontrols.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <!--
        放大/缩小按钮控件
    -->
    <ZoomControls android:id="@+id/zoomControls"
        android:layout_width="wrap_content" android:layout_height="wrap_content"></ZoomControls>

</LinearLayout>

_ZoomControls.java

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Toast;
import android.widget.ZoomControls;

public class _ZoomControls extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.zoomcontrols);

        setTitle("ZoomControls");

        ZoomControls zoomControls = (ZoomControls) this.findViewById(R.id.zoomControls);
        // setOnZoomInClickListener() - 响应单击放大按钮的事件
        zoomControls.setOnZoomInClickListener(new OnClickListener() {
            public void onClick(View v) {
                Toast.makeText(_ZoomControls.this, "单击了放大按钮", Toast.LENGTH_SHORT).show();
            }
        });
        
        // setOnZoomOutClickListener() - 响应单击缩小按钮的事件
        zoomControls.setOnZoomOutClickListener(new OnClickListener() {
            public void onClick(View v) {
                Toast.makeText(_ZoomControls.this, "单击了缩小按钮", Toast.LENGTH_SHORT).show();    
            }
        });

    }
}

2、Include 的 Demo
include.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <!--
        include - 整合控件，将指定的 layout 整合进来
            layout - 指定需要整合 layout
    -->
    <include android:id="@+id/cell1" layout="@layout/include_1" />
    <include android:id="@+id/cell2" android:layout_width="fill_parent" layout="@layout/include_2" />

</LinearLayout>

include_1.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:text="TextView01" android:layout_width="wrap_content"
    android:layout_height="wrap_content">
</TextView>

include_2.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:text="TextView02" android:layout_width="wrap_content"
    android:layout_height="wrap_content">
</TextView>

_Include.java

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;

public class _Include extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.include);

        setTitle("Include");
    }
}

3、VideoView 的 Demo
videoview.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <!--
        VideoView - 视频播放控件
    -->
    <VideoView android:id="@+id/videoView" android:layout_width="wrap_content"
        android:layout_height="wrap_content">
    </VideoView>
        
</LinearLayout>

_VideoView.java

package com.webabcd.view;

import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;
import android.widget.MediaController;
import android.widget.VideoView;

public class _VideoView extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.videoview);

        setTitle("VideoView");
        
        VideoView videoView = (VideoView) findViewById(R.id.videoView);
        
        // 指定需要播放的视频的地址
        videoView.setVideoURI(Uri.parse("android.resource://com.webabcd.view/" + R.raw.demo));
        // videoView.setVideoPath();
         
        // 设置播放器的控制条
        videoView.setMediaController(new MediaController(this));
        // 开始播放视频
        videoView.start();
    }
}

4、WebView 的 Demo
webview.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <!--
        WebView - 浏览器控件（WebKit 内核）
    -->
    <WebView android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:id="@+id/webView" />
        
</LinearLayout>

_WebView.java

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;

public class _WebView extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.webview);

        setTitle("WebView");
        
        WebView webView = (WebView) findViewById(R.id.webView);

        // 配置浏览器，使其可支持 JavaScript
        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        
        // 清除浏览器缓存
        webView.clearCache(true);
        // 指定浏览器需要解析的 url 地址
        webView.loadUrl("http://webabcd.cnblogs.com/");
        // 指定浏览器需要解析的 html 数据
        // webView.loadData("<a href='http://webabcd.cnblogs.com/'>webabcd</a>", "text/html", "utf-8");
    }
}

5、RatingBar 的 Demo
ratingbar.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <!--
        RatingBar - 评分控件
            numStars - 评分控件的星星的数量
            rating - 当前评分的值    
    -->
    <RatingBar android:id="@+id/ratingBar" android:numStars="5"
        android:rating="1.5" android:layout_width="wrap_content"
        android:layout_height="wrap_content">
    </RatingBar>

    <TextView android:id="@+id/textView" android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

_RatingBar.java

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.widget.RatingBar;
import android.widget.TextView;

public class _RatingBar extends Activity implements RatingBar.OnRatingBarChangeListener {

    private RatingBar mRatingBar;
    private TextView mTextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.ratingbar);

        setTitle("RatingBar");

        mTextView = (TextView) findViewById(R.id.textView);
        mRatingBar = (RatingBar) findViewById(R.id.ratingBar);

        // setOnRatingBarChangeListener() - 响应评分值发生改变的事件
        mRatingBar.setOnRatingBarChangeListener(this);
    }

    @Override
    public void onRatingChanged(RatingBar ratingBar, float rating,
            boolean fromUser) {
        mTextView.setText(String.valueOf(rating));
    }
}

6、Tab 的 Demo
tab.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent" android:layout_height="fill_parent">

    <!-- Tab 1 的内容　-->
    <TextView android:id="@+id/view1" android:layout_width="fill_parent"
        android:layout_height="fill_parent" android:text="tab1 content" />
        
    <!-- Tab 2 的内容 -->
    <TextView android:id="@+id/view2" android:layout_width="fill_parent"
        android:layout_height="fill_parent" android:text="tab2 content" />

</FrameLayout>

_Tab.java

package com.webabcd.view;

import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.widget.TabHost;

// 实现 Tab 功能的话要继承 TabActivity
public class _Tab extends TabActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

        TabHost tabHost = getTabHost();
        LayoutInflater.from(this).inflate(R.layout.tab, tabHost.getTabContentView(), true);

        // Tab 1 的内容
        tabHost.addTab(tabHost.newTabSpec("tab1")
                .setIndicator("tab1")
                .setContent(R.id.view1));
        
        // Tab 2 的内容（设置了 Tab 图片）
        tabHost.addTab(tabHost.newTabSpec("tab2")
                .setIndicator("tab2", getResources().getDrawable(R.drawable.icon01))
                .setContent(R.id.view2));
        
        // Tab 3 的内容（设置 Tab 的内容为指定的 Activity）
        tabHost.addTab(tabHost.newTabSpec("tab3")
                .setIndicator("tab3")
                .setContent(new Intent(this, _TextView.class)));

    }
}

7、Spinner 的 Demo
spinner.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <TextView android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:id="@+id/textView" />

    <!--
        Spinner - 下拉框控件
    -->        
    <Spinner android:id="@+id/spinner" android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

_Spinner.java

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

public class _Spinner extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.spinner);

        setTitle("Spinner");

        Spinner spinner = (Spinner) findViewById(R.id.spinner);
        
        // 设置下拉框控件的标题文本
        spinner.setPrompt("请选择");
        // 实例化适配器，指定显示格式及数据源
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
                this, R.array.colors, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(adapter);

        // setOnItemSelectedListener() - 响应下拉框的选中值发生变化的事件
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> arg0, View arg1,
                    int arg2, long arg3) {
                TextView textView = (TextView)_Spinner.this.findViewById(R.id.textView);
                textView.setText(((TextView)arg1).getText());
            }

            @Override
            public void onNothingSelected(AdapterView<?> arg0) {
                                
            }
        });
    }
}

8、Chronometer 的 Demo
chronometer.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <!--
        Chronometer - 计时器控件
    -->
    <Chronometer android:id="@+id/chronometer"
        android:layout_width="wrap_content" android:layout_height="wrap_content" />

    <Button android:id="@+id/btnStart" android:layout_width="wrap_content"
        android:layout_height="wrap_content" android:text="开始计时">
        <requestFocus />
    </Button>

    <Button android:id="@+id/btnStop" android:layout_width="wrap_content"
        android:layout_height="wrap_content" android:text="停止计时">
    </Button>

    <Button android:id="@+id/btnReset" android:layout_width="wrap_content"
        android:layout_height="wrap_content" android:text="计时器复位">
    </Button>

</LinearLayout>

_Chronometer.java

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.os.SystemClock;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Chronometer;

public class _Chronometer extends Activity {

    private Chronometer mChronometer;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.chronometer);

        setTitle("Chronometer");

        Button button;

        mChronometer = (Chronometer) findViewById(R.id.chronometer);
        // 设置计时器所显示的时间格式
        mChronometer.setFormat("计时：(%s)");
        
        button = (Button) findViewById(R.id.btnStart);
        button.setOnClickListener(mStartListener);

        button = (Button) findViewById(R.id.btnStop);
        button.setOnClickListener(mStopListener);

        button = (Button) findViewById(R.id.btnReset);
        button.setOnClickListener(mResetListener);
    }

    View.OnClickListener mStartListener = new OnClickListener() {
        public void onClick(View v) {
            // 启动计时器
            mChronometer.start();
        }
    };

    View.OnClickListener mStopListener = new OnClickListener() {
        public void onClick(View v) {
            // 暂停计时器
            mChronometer.stop();
        }
    };

    View.OnClickListener mResetListener = new OnClickListener() {
        public void onClick(View v) {
            // 复位计时器，即停止计时器
            mChronometer.setBase(SystemClock.elapsedRealtime());
        }
    };
}

9、ScrollView 的 Demo
scrollview.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <!--
        ScrollView - 滚动条控件
            scrollbarStyle - 滚动条的样式
    -->
    <ScrollView android:id="@+id/scrollView"
        android:layout_width="fill_parent" android:layout_height="200px"
        android:scrollbarStyle="outsideOverlay" android:background="@android:drawable/edit_text">
        <TextView android:layout_width="fill_parent"
            android:layout_height="wrap_content" android:id="@+id/textView" />
    </ScrollView>

</LinearLayout>

_ScrollView.java

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class _ScrollView extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.scrollview);

        setTitle("ScrollView");

        TextView textView = (TextView)this.findViewById(R.id.textView);
        textView.setText("a\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na");
    }
}

OK
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